Amazon offers Prime members the SanDisk 64GB Ultra Fit USB 3.0 Flash Drive, model no. SDCZ43-064G-G46, for $22.99 with free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, it adds $8.05.) That's the lowest total price we could find by $12. It features read speeds of 130 MB/s and is backwards compatible with earlier versions of USB.